> Organic teas are sold at a premium price but do not offer the "purity" you
> seek,unless you grow it yourself.

That's quite correct. There are organic teas grown and produced in
China. But don't fool yourself. Many places in China are heavily
polluted. And pollution knows no borders. So, say your farm is
organic, there is nothing you can do to prevent chemicals from rain
leaching and accumulating in the soil; or chemicals in dust and
residues blown in by the wind. Even if you grew tea yourself in China,
there is nothing you can do to ensure it's 100% pure. There's only so
much a person can do. In China, "clean and pure" just means,
relatively speaking, as clean and pure as can be, giving the
environmental circumstances of the country. So, farmers try to grow
good tea as far as possible away from human settlement - up in some
tea mountains somewhere. Then, the cheap tea they grow in gardens
around their houses - and that stuff is polluted and contaminated like
heck.